CP3UB26 datasheet(49/268 Pages) NSC

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10.3.4

Interrupt Enable and Mask Register 0 (IENAM0)

The IENAM0 register is a word-wide read/write register

which holds bits that individually enable and disable the

maskable interrupt sources IRQ1 through IRQ15. The reg-

ister is initialized to FFFFh at reset.

IENA

Each Interrupt Enable bit enables or disables

the corresponding interrupt request IRQ1

through IRQ15, for example IENA15 controls

IRQ15. Because IRQ0 is not used, IENA0 is

ignored.

– Interrupt is disabled.

– Interrupt is enabled.

10.3.5

Interrupt Enable and Mask Register 1 (IENAM1)

The IENAM1 register is a word-wide read/write register

which holds bits that individually enable and disable the

maskable interrupt sources IRQ16 through IRQ31. The reg-

ister is initialized to FFFFh at reset.

IENA

Each Interrupt Enable bit enables or disables

the corresponding interrupt request IRQ16

through IRQ31, for example IENA31 controls

IRQ31.

– Interrupt is disabled.

– Interrupt is enabled.

10.3.6

Interrupt Enable and Mask Register 2 (IENAM2)

The IENAM2 register is a word-wide read/write register

which holds bits that individually enable and disable the

maskable interrupt sources IRQ32 through IRQ47. The reg-

ister is initialized to FFFFh at reset.

IENA

Each Interrupt Enable bit enables or disables

the corresponding interrupt request IRQ32

through IRQ47, for example IENA47 controls

IRQ47.

– Interrupt is disabled.

– Interrupt is enabled.

10.3.7

Interrupt Status Register 0 (ISTAT0)

The ISTAT0 register is a word-wide read-only register. It in-

dicates which maskable interrupt inputs to the ICU are ac-

tive. These bits are not affected by the state of the

corresponding IENA bits.

IST

The

Interrupt

Status

bits

indicate

maskable interrupt source is signalling an in-

terrupt request. IST15:1 correspond to IRQ15

to IRQ1 respectively. Because the IRQ0 inter-

rupt is not used, bit 0 always reads back 0.

– Interrupt is not active.

– Interrupt is active.

10.3.8

Interrupt Status Register 1 (ISTAT1)

The ISTAT1 register is a word-wide read-only register. It in-

dicates which maskable interrupt inputs into the ICU are ac-

tive. These bits are not affected by the state of the

corresponding IENA bits.

IST

The

Interrupt

Status

bits

indicate

maskable interrupt source is signalling an in-

terrupt request. IST31:16 correspond to

IRQ31 to IRQ16, respectively.

– Interrupt is not active.

– Interrupt is active.

10.3.9

Interrupt Status Register 2 (ISTAT2)

The ISTAT2 register is a word-wide read-only register. It in-

dicates which maskable interrupt inputs into the ICU are ac-

tive. These bits are not affected by the state of the

corresponding IENA bits.

IST

The

Interrupt

Status

bits

indicate

maskable interrupt source is signalling an in-

terrupt request. IST47:32 correspond to

IRQ47 to IRQ32, respectively.

– Interrupt is not active.

– Interrupt is active.

IENA

Res.

IENA

IST

Res.

IST

CP3UB26 데이터시트(PDF) 49 Page - National Semiconductor (TI)

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